Octave 1 Piano Notes — Frequencies & Keys
12 keys from C1 (32.70 Hz) to B1 (61.74 Hz).
| Note | Frequency | MIDI | Key |
|---|---|---|---|
| C1 | 32.70 Hz | 24 | 4 of 88 |
| C#1 | 34.65 Hz | 25 | 5 of 88 |
| D1 | 36.71 Hz | 26 | 6 of 88 |
| D#1 | 38.89 Hz | 27 | 7 of 88 |
| E1 | 41.20 Hz | 28 | 8 of 88 |
| F1 | 43.65 Hz | 29 | 9 of 88 |
| F#1 | 46.25 Hz | 30 | 10 of 88 |
| G1 | 49.00 Hz | 31 | 11 of 88 |
| G#1 | 51.91 Hz | 32 | 12 of 88 |
| A1 | 55.00 Hz | 33 | 13 of 88 |
| A#1 | 58.27 Hz | 34 | 14 of 88 |
| B1 | 61.74 Hz | 35 | 15 of 88 |